Lifted2wd
Senior Member
I was able to regain about 2mpg after doing the spark plugs and adding a Spectre CAI to my truck. It is a 2015 with 5.7 Hemi and plugs are recommended to be changed every 30k miles.
Prior to plugs: 11.9mpg avg
2.5 hours and 16 burnt plugs later I was done. I can see why the dealership charges so much to do the spark plugs.
After plugs and CAI: 13.9~14.1mpg avg
The CAI for the price and design is not a bad investment. The woot on acceleration is great and I can tell a response difference. Plus def opens up the mufflers (flow master 40) more
**granted the MPG is skewed due to oversize tires and an unadjusted speedometer**
Prior to plugs: 11.9mpg avg
2.5 hours and 16 burnt plugs later I was done. I can see why the dealership charges so much to do the spark plugs.
After plugs and CAI: 13.9~14.1mpg avg
The CAI for the price and design is not a bad investment. The woot on acceleration is great and I can tell a response difference. Plus def opens up the mufflers (flow master 40) more
**granted the MPG is skewed due to oversize tires and an unadjusted speedometer**